test/system: Test the hard limit for the number of open file descriptors

Note that the soft limit for the number of open file descriptors cannot
be tested at the moment because Podman sets the Toolbx container to have
a value higher than the host's [1].

[1] containers/podman#17681

containers#213

test/system/210-ulimit.bats

@@ -0,0 +1,46 @@
+# shellcheck shell=bats
+#
+# Copyright © 2023 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load 'libs/bats-support/load'
+load 'libs/bats-assert/load'
+load 'libs/helpers'
+
+setup() {
+  bats_require_minimum_version 1.7.0
+  _setup_environment
+  cleanup_containers
+}
+
+teardown() {
+  cleanup_containers
+}
+
+@test "ulimit: number of open file descriptors (hard)" {
+  local limit
+  limit=$(ulimit -H -n)
+
+  create_default_container
+
+  run --keep-empty-lines --separate-stderr "$TOOLBOX" run ulimit -H -n
+
+  assert_success
+  assert_line --index 0 "$limit"
+  assert [ ${#lines[@]} -eq 2 ]
+
+  # shellcheck disable=SC2154
+  assert [ ${#stderr_lines[@]} -eq 0 ]
+}

test/system/meson.build

@@ -1,6 +1,7 @@
 test_system = files(
   '201-ipc.bats',
   '203-network.bats',
+  '210-ulimit.bats',
 )
 
 if shellcheck.found()